Add and Subtract Within 100: Practice 1In this Grade 2 lesson on Add and Subtract Within 100, you will practice solving problems like: "Liam has 32 books. Liam gets 6 more. How many books does Liam have now?". Work through each problem carefully, use the hints if you need help, and check your answers. This builds your understanding of add and subtract within 100 step by step.